JUBA, SOUTH Sudan — South Sudanese officials said Thursday that Sudanese troops were massing near the disputed border and that Sudan’s armed forces had bombed two oil wells in South Sudan.

A spokesman for South Sudan’s armed forces said two Sudanese planes dropped six bombs in Pariang county, along the north-south border, on Wednesday afternoon. Col. Philip Aguer said that at least one oil well had been damaged and was leaking into the ground, polluting drinking water.

Sudan has also been massing ground forces in a nearby town, he said.

… South Sudan became independent from Sudan in July, but many issues remain unresolved, including the demarcation of the border and the sharing of oil revenue.